. >> reporter: suspicious enough, teams from the fbi and atf will join the investigation. the office is shared by vallejo major ozzy davis who came to the scene along with his law partner michael thompson who he led away from the building. visibly upset. >> reporter: we're classifying this as a class of domestic terrorism. >> reporter: the office sits across the street from the courthouse so surveillance cameras may provide clues. the neighborhood gets its share of random vandalism, but the fire is much worse than anything davis' law office has faced before. >> acts of vandalism, such as broken glass, rocks through windows and things of that nature. >> reporter: davis has presided over rocky times, and was caught up in recent outcry over several officer involved shootings. whether politics played a role in the fire is a question investigators will hit hard. >> reporter: has the mayor had any threats against him personally? >> not to my knowledge, no. >> reporter: does he have protection right now? >> i'm not going to go into whether the mayor has protection or not. >> repo